Question

question # 1
multiple choice
what is a key fob?

a portable piece of diagnostics equipment
a security device that locks a vehicles internal communication systems
a device that connects vehicles via a network
a device used to lock and unlock vehicle doors remotely

Explanation:

Define a key fob

A key fob is a small, handheld electronic security device with built-in authentication used to control access to physical objects, most commonly vehicles.

Analyze the options

• Option 1: "a portable piece of diagnostics equipment" — Incorrect. Diagnostics equipment (like OBD-II scanners) is used to read vehicle error codes, not a key fob.
• Option 2: "a security device that locks a vehicle's internal communication systems" — Incorrect. Key fobs do not lock internal communication buses (like the CAN bus).
• Option 3: "a device that connects vehicles via a network" — Incorrect. This describes vehicle-to-vehicle (V2V) communication or a vehicle ad hoc network (VANET).
• Option 4: "a device used to lock and unlock vehicle doors remotely" — Correct. This is the primary consumer function of a vehicle key fob, utilizing Physical Device Security principles to transmit encrypted radio signals to the vehicle's receiver.

Answer:

• a portable piece of diagnostics equipment
• a security device that locks a vehicle's internal communication systems
• a device that connects vehicles via a network
• a device used to lock and unlock vehicle doors remotely (Correct answer)